exigency \EK-suh-jun-see; ig-ZIJ-un-see\ (noun) - 1 : The quality or state of requiring immediate aid or action; urgency. 2 : A case demanding immediate action or remedy; a pressing or urgent situation. 3 : That which is demanded or required in a particular situation -- usually used in the plural.
"You came for another purpose, we were speaking of other feelings; it is the hour of exigency you choose for these strange, these startling words." -- Benjamin Disraeli, 'Sybil or The Two Nations'
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Exigency comes from Medieval Latin exigentia, from the present participle of Latin exigere, to drive out, to force out, to exact, to demand, from ex-, out of + agere, to drive. The adjective form is exigent.